I was wondering if the lamp might be to high above the plants, I think its about a meter above them. Though they haven't stretched very much despite the distance I wonder if it might be beneficial to bring it closer?
Also the temperature has been a bit low the last couple of days. I figure that will rise as I add another "wall" to the growspace. Im gonna use a white sheet for the inside and a black one for the outside. Hopefully that will and reflect some light within the growspace and keep the light out during "night time". I'm going for the full isolation/disorientation=)